Composite roofing.



PATENTED APR. 10, 1906 G. P. BISHOPRIG.

COMPOSITE ROOFING.

APPLICATION FILED SEPT a. 1905.

WIN/E5555 W M W w w UNITED STATES PAEN T FFICE GEORGE FREDERICK BISHOPRIO, OF TORONTO,

CANADA, AssIeNoR TO BISHOPRIO & COMPANY, OF TORONTO, CANADA A FIRM.

COMPOSITE ROOFING- Specification of Letters Patent.

Patented April 10, 1906.

To all whom it may concern:

Be it known that I, GEORGE FREDERICK BISHOPRIO, contractor, of the city of Toronto, in the county of York, in the rovince of Ontario, Canada, have invented certain new and useful Improvements in Composite Roofings, of which the following is the specification.

In the drawin s, Figure 1 is a perspective view of a piece 0 the composite roofing, and Fig. 2 is a sectional view.

Iy invention relates to improvements in composite roofings; and the object of the invention is to devise a roofing of this class Whic will not be subject-to deterioration in ordinary Wear or tear or exposure to the sun and which will also be thoroughly fireproof; and it consists, essentially, of a roofing comprising an under layer 1, of tar-paper, a layer 2, of asphalt mastic, which is a mixture of asphalt arid lime, the residuum of the refining sugar, tar, cement, .or other plastic material, a layer 3, of'asbestos paper or other fireproof sheeting material, and a top layer 4, of asphaltmastic, and a final coating 5 of sand, gravel, or the like. This fireproof material is made in the form of sheets and is suitably affixed to the roof, the manner of fastening being unimportant, as there are various suitiibde means whereby such a sheeting may be In the practical demonstration of my composite metal roofing I have exposed to the weather the asphalt mastic, which is the preferred plastic material which I use in connection therewith and which will not melt or run from the heat of the sun and, indeed, when artificial heat or fire takes place on the top of the same will only melt slightly, and the under surface will be efiectually protected by the layer of the asbestos paper. Of course I do not wish to confine myself to how many layers of asbestos paper or asphalt mastic that may be employed; but for most purposes one layer of asbestos paper with the asphalt mastic on each side is sufficient.

Although I have described asphalt mastic as the preferable material to be used on each side of the asbestos paper, it will be under stood that tar, cement, resin, or other preferred material may be adopted.

l/Vhat I claim as my invention is 1. A composite roofing comprising an under layer of suitable material and an upper layer of asbestos paper having a su er and sub layer of asphalt-mastic materia as and for the purpose specified.

2. A composite roofing comprising an under layer of suitable material and an upper layer of asbestos paper having a su er and sub layer of asphalt-mastic materia and a coating of sand for the superlayer of asphaltmastic material as specified.

3. A composite roofing comprising a layer of asbestos paper, a super and sub layer of asphalt-mastic material and a lowermost layer of tar-paper and a suitable coating of sand or the like as and for the purpose specified GEORGE FREDERICK BISHOPRIC. 

